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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aab99ccfb8159fbbc70a885f0011c72e6d925305c10c9fd440c592caf71840c' 
  AND token = 'unbysXYuP2ZIymyBxRTIMjrcKdvqti3H+RHNgHlGHlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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