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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac011cb6aac946591d1c684298b8c94d1a2027275416e71c1b191e0ece3c5697' 
  AND token = 'LT6kJ2ETr+k1e9JH5puL7ZeL3eEfVCfSfJ6bf70eE0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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