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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9a7e2737084e22b15cc57d299c1176bddf0e6dcf9f71c1d5e983770997dd0e' 
  AND token = 'Lh6BJwl7eoLycWt8pZtgV5/4rZFpscwzM+jfBCtaIMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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