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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c27d1c697ea34ac74c9bab993fd3e9f49daf24c0ec214ef6546db0672af715d1' 
  AND token = 'AohBSzBiJpHCWRv/RsRBlph25GM3ezbzij4yEeq45ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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