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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415dcdcb4aa9af1190beaf52daf1a48519090f29099a2f926e9d82b6dd772acc' 
  AND token = 'W9czMr5jk0+bNrk3Yv/VE313U8Are8+1+Clrz9FymSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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