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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e023bc998552eed2ab0247a21ea4ad7673cbee44c6622b712554859ec87fbf5' 
  AND token = 'jHXC8TTgB4KB2KNSmpYZBe9Nb4tFG3Tzjzd+IdfvkfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00221

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}