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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a62f2fa8773cd00c9572054d115c1085ecc7cc643bbb599c8ed16289810d73' 
  AND token = '0kS5rzJc9wshdrJ8TpPArKX/demvLF0Tp7Tff75Cyb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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