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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0259aff93500c54df066be419c8cab6c1967a0e27bed645cd80dabf05f384d' 
  AND token = 'OaibOT43aydwKSYjMfB4ZOXwQTxeH4q1t0HKhA9yf6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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