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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24285bf9961c7f6de4de027940993eebded961554648a1172f80ca547f59de44' 
  AND token = 'ocgo8jnHDQMwVAb4bOZ1DNNbuASIJHdyBHvoa4gxjBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00195

JSON explain

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