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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb99688e8fb188022b8bdb296f1c44112c0ba14a893713af6d65ba76eae6b98' 
  AND token = '46bYkX9zpDvRAnCreSWE10MDl1Fdcssc3nULHSsm1cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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