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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6fc1ad688de6d26e55411a1ee1130a3f180dc7e00596912ad2a13aa47d58bd' 
  AND token = 'FbWFvrlwvXattBp85sLlE59yJ1SUjdY4ZiRAcfYEu2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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