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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984ee6c6dcd23711359d2e0f621ace2230194eead6687dac7f53d3267b86d38d' 
  AND token = 'xS0C+lL+Hs7jY4gtONv48XaNnIzaunImXybGA4bn9vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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