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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929800792c5a09674438b6fe8d79e101dd70deafb49b6c78b18cf7a1c7eccabe' 
  AND token = 'StK/6TdYRbi/WvcXx93/hTfyvjXE91mLtmGg8p3vXfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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