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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdaf83c9b826f9bede3611637f160dfef55de9e6777d22793f0b69331fac079' 
  AND token = 'kbLeJO4eSBLJHVEGrGkzmbhfK6knK1SdkX4wqSDNSaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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