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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591b88311d29421864986e8fcab1d846bd56d16f6d8be6fb6eb3834e3a01a63d' 
  AND token = '86fiZM5cKCJGe80bgOV0zoS4Kx5baHN4sG8wPpKxFzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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