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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f4b9e886a69adc3daf2de4526200474b6f2b58c217ee7657feb58fc6de0893' 
  AND token = '82xl8jkvzNeIctRfx0COSoosX1/F4/Zh+0YnntCarcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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