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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f96142dfdd62c8a40a1a5be7907bc657f0924f5af25d739a4fff3d1dccd2d8' 
  AND token = 'Xi1lxN5QqXNpzDf9UfqZdkKzHc/NLWjGX/2ZwWp+qk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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