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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98887783299ad4d7fd29737cffc9ce291dad963d8132dcced3fabffb3294d065' 
  AND token = 'QxQb8J4hTwBsPG5+tle7fpJ6Nxud+KvgqVC0tkicOpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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