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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa05219e656e48c583b388e20bb9862f0c3cb05cb11a3412081d51a37f9ce85' 
  AND token = 'TRWqT44F9zhOo9lv1Mlmo+87YxS0xRTBXowEc4OauIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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