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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054a1e3759a25d3734234b79d2ef2129f7f8a2a18e7ae6f552f71ca8ec388d80' 
  AND token = 'n+gm4LkvXgKmhEpeZ3mW7Cs45gEMQlPiyWzMqEJs+eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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