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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459f98f79629a9ad96141a17a9baef7982fac3bb9970138f884e0a7d0307992a' 
  AND token = 'CWZ5V0fJnykYmFq0Qp+ie+KxcY7GFSxgeSTUsqsWTIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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