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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc56fde3fa522e7430fb72fb80e37e429a724c96795fa39f8b646f170ff177f' 
  AND token = '8OS+1e1/ACvw0shTd0HhJIoQ++1rSNdqThI5FlydHqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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