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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebca186b8a06266ccfb791cddbcffe2683e80e855f2954cef555f0d842ff06be' 
  AND token = '8Q4tDB4rMwNMrMIiVTG0Jy62hut4r2lxXEaPHmML2Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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