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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfe44904390921d8146b9d4e0caeed74e73e4bbcd98046de5085a628fce9580' 
  AND token = '6IAMxc1Gtdh4mh7aCHatGEnKVGp4OcHlR8XwDk/tbEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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