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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe6e3972c1990bf71d9e296dfed582c553ec18c979e7e2384673a8e2f78d80a' 
  AND token = '+CZS4SVY6l/5CGUTIjOd0vDNiGXVSoLJRGjck/IF3po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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