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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b3d083e8be7ab505a25d4559fc13146b981b2227530908e9108dfdbc1c0ad4' 
  AND token = '97FUK1zYK+0SH01FDAalxeVzyX03bw8qhlndkbauDGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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