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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89173f7aeab9618ae4bd0ec029e0fdfba51b0da217dd277e84044e8068517bca' 
  AND token = 't6YY3if5rMI+O12hv0AV0lat8ASWfps4lqy0STfAAX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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