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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7b15f3341863774e00fdc6e2ba181bf3a86a569067d9f095c922f6e80871e8' 
  AND token = 'DU8FUcWZDQU05+lCmkvZeyHAeNffbAbRnl4ldNnQpz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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