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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be2db330065dea0d7c6b8434303191d6e0ac9c9a0e71f260d0af0d1dac7e085' 
  AND token = '3Attkw2x9lCdWyskaIsbFiDpB4J/h5VN/4aG6m0LFYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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