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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b720aed96cce97ab4d7a970b67fdf9eb517d5cfe0e835567832b8cfb62e5a46e' 
  AND token = 'E+aILnwgg9TnvccJof0xGRJmCRFkWILY8rzCIfM42FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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