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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272cc9baed38093d2db5c6463d0a27c9249150295fda6ea1f6abdb29762eec2f' 
  AND token = '7Ww81IKT7JIH6TzjMNfyTIc1Mz1aMCOg7cO3VDXduLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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