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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7b1d8e7cb7e0bd29dd5a0ba0be95394b9e32f47a6efa2e151a8c146936220b' 
  AND token = 'ZyuD2ZusB45igJfJ9ojIpDOvRAIwsdvN4cu/V/VQ22Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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