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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56970986d0db5b4824dc53c902568ed9a81d28e680f61bf525e22215cad54417' 
  AND token = '8cA9sgJU3LH81MHCXqktWMpwm1fXTRHx0Efiu8gTCxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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