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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f30cd6bf8bc68eb4da0352b26f7f833e8054dedd43da90862280cea9735823f' 
  AND token = 'yyNXFazeAxX9YX37w7VH61BCFsEdGLWpVWnAia1VGyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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