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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2942d2535b8cd819933a481346723be9a5a798aefd9bf7932dba73bcf3637e17' 
  AND token = 'GGAupWMiXSB0FiEjlHF/lWBe7TPstt3V44Co1xAcTpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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