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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c3262919c8fc6f4f58012e0c52ef5ac73cdc522e6ad1bcce4ca39f6f0ef38c' 
  AND token = 'kVcBVZS0FYR5wF6aGSEci4ErtsgRD4qCU+gRH14sY9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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