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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb797513512c886ec9cdb8a2b1c1ef4a2cb0e0e7c3734d519b6aea1014dff2f8' 
  AND token = 'ZioTJ78W02uhag7YtSfAQOzB2af+NNAT4XytJ8mheWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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