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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deca608d47fc4fd52db68f1cdef5b224d35a2160aa09385e6c4f7126133d8fc7' 
  AND token = 'dYBBnSeOiIUagN3MSK6FZc1nM1cyUnwSD9+F+MokFZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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