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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93197dec1219e46023eaf72cd80bb7988912fb7793e9c46004fec9075a8937f0' 
  AND token = 'qXD+94pvIWA1kWsAZLXLTz+LBa523MM4UFTpTwYGs5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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