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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f199270404c9671c6b4b8d7c52ec510159da07b598570f7128b84dc8ac1732fe' 
  AND token = 'IFz2inoUqutDyLg2w5kaXy5i5/pVhWC/3lP873OYSTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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