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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6333e5bb651bcca63d2754cf4a1e53c298b2f7c1d0454924ac978b9f0db1c1dd' 
  AND token = 'JdFAojR8agzw9/nVKI4Tn0zcY1l0c4JI8qb5eBb0YRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00384

JSON explain

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