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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371f3a60b05abe100ab1e5d6b25fcdc5c2a05a701beebfd50079dac8806d1665' 
  AND token = 'tmzgdjHGkurElNP6P7YDonJ6AEXJnCf5L1RKvJbo63M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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