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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fbf56f0ccf1a60b0a342f224f96bf52f8d9047c35ba602d801d9f53f439c56' 
  AND token = 'EyPqdX5se0x+kvRH263iV/zvqdKhZySwNaFjHnHTQNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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