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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b945ed7972bdf8c0111f7dd0bd834e5f500ab5d984c90e85c7b40d1eb2d81889' 
  AND token = 'k//3Pqlmah71ZmaJ5MXIpPZeE3VAb7lanPMzRXt7JfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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