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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5cf4c92d19cc4aeac36cd81be0aadb9f3ed1dac5ab4db3e513eb8245f06e38' 
  AND token = 'jY695uLRpu1fv0MLkVph3X/Y96xe2OfwFEfLl3MFa7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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