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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2e6837f6e78677e17622383a11a5e34ba4f40ce7fa838ebe85ba4e51d15c51' 
  AND token = 'jNvkoapyrKpP/A+8FCHhOL3d5ocw5UQbthIpiZyiBNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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