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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3921804c189c869086c64caf0d313d860c5622bf400835a332dcec5b5cedf7ea' 
  AND token = 'NGCmDK+LQXvcq2pHV7nj6i+xf/hpFasUb4skHIx+cRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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