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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2beab4b3d39def85db2555e16a3993cd47ead1ca3a36cab114246c7d05d704fd' 
  AND token = 'GxmVN5sNeQ68sQb46a/+ykZyuWVG4jp6xy6WY6vMrcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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