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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db970a84fb74563615d68fdd24c0b4349cc445d4321897fb26f80641698d127' 
  AND token = 'iL5k1qEuGub7H6dKSbeSeDhDqiXBJ2QiTi8YM+GYsC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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