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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330d513ff65333c6baaab2020c45f3b52c89b1541ec0e821d703e014cd97cc8a' 
  AND token = '0gP6chwJR2ddyc5xlPElgs8bmqNGlsUCR0pO04fo55Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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