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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0526d4be4d286019ce0b69811db66c55ab6a9babd367e2419f8762c8d44709' 
  AND token = 'iHpuMuz0mnrWSl8kd1nRUtOOHvUROix8SKuo67yxpgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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