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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0d99ba073465d4faafbb20883aaae5f179d8a547c82e242841a3d4aff6746d' 
  AND token = '2FyB8VLpFu0SPP+H7yrxeSjvO0neXy5oXbyQMKFMj9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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