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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ab88d64b3a321f8da7bcea9e7c179c5a744f6df4cc7eb9f640b67bc44a01fb' 
  AND token = '3tp++DrtYclGQNJIvWYDaS+waaNgcSz51+7URD5P7bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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