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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b295472270565fc5b1cb5d58beaf5199b59351c7d2ca9030b74e0b09592f216' 
  AND token = 'rCW9jTVhIRkoIV6CU2csjseho7Vf8EbsAw26CWkwQrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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