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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de588cb3c90b9687e72b02a6679ef360edd1b715ba27278178d0799ae01bf89' 
  AND token = '5I8J0ZO0Qr2J+Tr4aXXzrDSCqGnTG+Gu5NvlIDpys7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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