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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90700a8ce11fe450ddc13b5e140913641bd817424c03a92d38a10b1c2f8e514' 
  AND token = 'yprdHZrMt86s6Huwk7mGAEzmnnut7kkMivM5Oy5C/bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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