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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8df918e3caec096f9e020b0e2b46d7de2dcc639aa21768dfb5e9b5ccbae6f0' 
  AND token = 'FM42LQnWbyfdabZ6J7ePD/3LXngN4A2LRO1Ju4/iZ0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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