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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d9e210b36f587c7a6f5616cf0196c0c799f01bacb0f257b4bc8dca7492a911' 
  AND token = 'WhruEXWgYRfzTRpAelhxjA1kZMwPRnR/jbsMZux/TgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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