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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6506e6f0ed8eb818e56c57653c880380a291a4e63eaabde988b1aaa3e1a4fb' 
  AND token = 'cHKREoZs8/wrFs+qTiDRtAGuMEryqObrvwLNnZau4xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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