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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3740992745c42a7f7815551a55a90b68854924cb0a277692f403ae5e5dcdc03e' 
  AND token = 'Osba/0udQIVIiHhEAk6E1ZzL2IJ0BQy5m9Jo1VHAqF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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