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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb12b01ae6a001d7a3c39d89382ad244e97e39685f33c768fe498686b5414072' 
  AND token = 'jY3HQLmkJkAl8mjljBT2uQlEx1uv7V/14XbZ8Z8gHDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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