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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57813bbc4353923fb8f1e9fea20dd03e66d69e023f137e97ff778ef8f0b2ace7' 
  AND token = 'iVNroMKY7wb4BDCUB2WeZlN73Uvco8+5mLPvYZLqVVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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