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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ea2cdf0b873cd46e11d52d34cb7d15793c7819b04778a3b62e7e533b9739d2' 
  AND token = 'm8ylo3kS0mqNMTi39gRV5x/Ca05vZviKILA3gHBHg2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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