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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9d8a0707ac4668f0ca7bc7b94244219783826c812699ed223aa897256895b1' 
  AND token = 'j0i9HAyYb7fAXjRnKSTSLYqOGA9pNOMdUMakD79vTTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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