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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992fc1ab164bf9158db2752a4793ce3f2aade262cdaab17452b8ebe3e0696da1' 
  AND token = '956U+2tRzs+N3hD79NnMHkWR/U/wiZmTvUOR6qDtbRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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